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Blast it, if it gets suspended you're at/near the limit.
Max IO limit of what? Could you try providing less information next time? /s
iotopcommand can give you some clue, but it's difficult to quantify I/O precisely.@VirMach is the only provider I used that has a strict I/O limit. I hope they can write two paragraphs about how we are supposed to measure it.
If you are using cPanel, it will show you the graph and table about hitting max I/O.
Sorry for not being clear.
I have a VPS that runs on SAS, so disk speed is lower than SSD/NVMe.
What tools should I run and what metrics should I read to measure correctly the IO that the disk support and if I'm near it's limit, before start seeing some relevant performance degradation.
any live monitoring should do. watch out for IO-wait.
measuring the max performance can be done with fio. keep in mind that there are at least two things to factor in on the IO capacity - one being the raw IOps and the other one being the highest possible transferrate for the interface/connection of your storage.
that's why you want to measure IO with different blocksizes to simulate workload with lots of small files/data which will rather be limited by IOps as such vs workload with large files/blocks, more likely limited by bandwidth than IOps.
if you look at that and then somehow can describe your real-life workload, you should get an idea, of what you can do and how much breathing room you have.
I remember your other topic and guess you are still not convinced about SAS not being a problem though ;-)
I kept the SAS since it has a very good performance atm, hopping to see what easter promos have to show!
Command you most likely want is:
iostat -xm 1You may also be interested in disk I/O benchmark tools like
bonnie++,filebench,sysbench, or evenpv.To get performance history on your system, try:
sar -AMax IO limit how?